Microsoft will be supplying live streams on Xbox.com, through the Xbox Live Events Player on your Xbox One or Xbox 360, on a big screen at a local Microsoft store and on their Xbox Twitch Page. You can also watch it live on Spike TV!

What can I expect?

New unannounced IPs, Halo Wars 2, Forza Horizon 3, Gears of War 4 and even rumors of new hardware!

How can I participate?

You can join us in this very thread to discuss the event or if you live in LA you might be able to join the Xbox FanFest.

It's an exclusive Microsoft catered event for Xbox fans in the local LA area, only a lucky 500 get in but if you do they have an awesome event planned out for you; including a backpack full of swag. Click Here for More Details

What 3rd Party websites can I watch talk over the Microsoft Conference?

I'm sure I'll find more soon but for now Giant Bomb is a prime choice. Click Here

Where can I learn more about what Microsoft has planned for E3?

Major Nelson has released a huge page with tons of information about their plans. Click Here